JPH04270600A - Video/audio signal reproducing device - Google Patents

Abstract

PURPOSE:To implement natural reproduction of sound field in which a picture and an audio image are coincident in the video/audio reproducing device having plural audio channels. CONSTITUTION:A 1st center channel speaker 7 is arranged under a screen and a 2nd center channel speaker 23 is arranged above the screen. A center channel audio signal 2 is branched into a 1st center channel audio signal 20 and a 2nd center channel audio signal 21 by a distributer 19, the 1st center channel audio signal 20 is reproduced by a 1st center channel speaker and the 2nd center channel audio signal 21 is reproduced by a 2nd center channel speaker to localize a sound image of the center channel onto the screen.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to correction of sound image localization in a multi-channel audiovisual reproducing apparatus having a plurality of audio channels.

0002

2. Description of the Related Art FIG. 8 is a block diagram of a device for reproducing 3-1 audio 4-channel stereo audio and video for, for example, a high-definition television, FIG. 9 is a sectional view of the device, and FIG. 10 is a block diagram of the device. It is a front view. In the figure, (1
) is a multi-channel audio source, such as a high-definition television tuner. (2) is a center channel audio signal sent from multichannel audio source (1), (3) is a right channel audio signal sent from multichannel audio source (1), and (4) is a center channel audio signal sent from multichannel audio source (1). ) left channel audio signal sent from
(5) is a rear channel audio signal sent from the multi-channel audio source (1). Also, (6) is a first power amplifier that amplifies the center channel audio signal (2), and (7) is a first center channel speaker driven by this first power amplifier (6), which is located at the bottom of the screen. It is located in (8) is a third power amplifier that amplifies the right channel audio signal (3);
(9) is a right channel speaker driven by this third power amplifier (8), (10) is a fourth power amplifier that amplifies the left channel audio signal (4), (1
1) is a left channel speaker driven by this fourth power amplifier (10), (12) is a fifth power amplifier that amplifies the rear channel audio signal (5), (
13) is a rear channel speaker driven by this fifth power amplifier (12), (14) is a television receiver, (15) is a viewer, and (16) is a cathode ray tube.

Next, the operation will be explained. The four-channel audio signals (2), (3), (4), and (5) emitted from the multi-channel audio source (1) are transmitted to a first power amplifier (6) and a third power amplifier ( 8), fourth power amplifier (10), fifth power amplifier (12)
The power is amplified by the first center channel speaker (7), right channel speaker (9), left channel speaker (11), and rear channel speaker (13).
) is converted into sound and perceived by the viewer (15).

0004

[0006] The conventional audiovisual reproducing apparatus is constructed as described above, and the center channel speaker is placed below the television screen. Therefore, such a device has a problem in that the center channel sound image (17) is localized below the screen where the center channel speaker is located, as shown in FIG.

[0005] This invention was made to solve the above-mentioned problems, and it is possible to localize the sound image (18) on the screen and reproduce a natural sound field in which the picture and the sound match. The purpose of the present invention is to obtain a video/audio playback device that can perform the following functions.

[0006]

[Means for Solving the Problems] In the audiovisual reproduction device according to the present invention, a plurality of speakers outputting a plurality of channels of audio signals as audio output at least a center channel audio signal of the plurality of channels of audio signals using a cathode ray tube or the like. a first center channel speaker that outputs audio from the lower side of the screen of the video display means; and a second center speaker that outputs the center channel audio signal among the multiple channels of audio signals as audio from the upper side of the screen of the video display means. A channel speaker.

[0007] Furthermore, the video/audio reproducing apparatus according to claim 2 is characterized in that the second center channel speaker is disposed above the screen of the video display means so as to output audio upwardly.

[0008] The audiovisual reproduction device according to claim 3 is the audiovisual reproduction device according to claim 2, further comprising: a center channel for supplying a multi-channel audio source to the first center channel speaker and/or the second center channel speaker; The present invention is characterized by having a predetermined number of delay circuits that delay channel audio signals and synchronize arrival times of audio from the first center channel speaker and the second center channel to the viewer position.

The audiovisual reproduction device according to claim 4 is the audiovisual reproduction device according to claim 2, further comprising: supplying the multichannel audio source to the first center channel speaker and/or the second center channel speaker. The present invention is characterized by having means for adjusting the level of the center channel audio signal supplied to the center channel speaker. The audiovisual reproduction device according to claim 5 is the audiovisual reproduction device according to claim 2, which includes:
Furthermore, the present invention is characterized in that it includes a predetermined number of delay circuits that delay the audio signals output from the multi-channel audio source and supply the delayed audio signals to the corresponding speakers.

0010

[Operation] In the multi-channel audiovisual reproduction apparatus according to the present invention, a center channel audio signal is output as audio from the first center channel speaker and the second center channel speaker. The first center channel speaker is provided at the bottom of the screen, and the second center channel speaker is provided at the top of the screen. Therefore, the audio related to the center channel is
It arrives at the viewer's position from the screen direction of the video display means. Therefore, audio reproduction of other channels is performed so as to match the screen of the video display means, that is, to localize the sound image on the television screen, together with the speakers of other channels.

[0011] In the multi-channel audiovisual reproduction device according to claim 2, since the second center channel speaker is arranged to face upward, the appearance of a conventional television receiver or the like is not significantly changed; , the device according to claim 1 is realized while maintaining the aesthetic appearance.

In the audiovisual reproduction apparatus according to the third aspect of the present invention, the arrival times of the reproduction sound of the first center channel speaker and the reproduction sound of the second center channel speaker at the viewer position coincide.

In the video/audio reproducing apparatus according to the fourth aspect, the levels of the reproduced sounds of the first and second center channel speakers are matched by adjustment.

[0014] In the video/audio reproducing apparatus according to the fifth aspect, the arrival times of sounds at the viewer's position also match for speakers relating to channels other than the first and second center channel speakers.

[0015]

Embodiments FIGS. 1 to 4 are cross-sectional views showing embodiments 1 to 4 of the present invention. For parts other than the center channel,
Since it is the same as the conventional example, the explanation will be omitted and focus only on the center channel.

Example 1. In FIG. 1, (1) is a multi-channel audio source, such as a high-definition television tuner. (2) is a center channel audio signal sent from the multi-channel audio source (1). (19) is a distributor that branches the center channel audio signal (2) into two, a first center channel audio signal (20) and a second center channel audio signal (21). (6) is a first center power amplifier that amplifies the first center channel audio signal (20), and (22) is a second center power amplifier that amplifies the second center channel audio signal (21). be. Further, (7) is a first center channel speaker driven by the first center power amplifier (6), and is arranged below the television screen. (23) is a second center channel speaker driven by the second center power amplifier (22), and is placed above the television screen.

Next, the operation will be explained. The center channel audio signal (2) is split into two audio signals, a first center channel audio signal (20) and a second center channel audio signal (21), by a distributor (19). The branched first center channel audio signal (20) is amplified by the first center power amplifier (6). Further, the second center channel audio signal (21) is amplified by the second center power amplifier (22). Above first center power amplifier (6)
The output signal is reproduced by the first center channel speaker (7) placed below the television screen. In addition, the output signal of the second center power amplifier (22) is sent to the second center channel speaker (22) placed above the TV screen.
3) is played.

By thus reproducing the sound using the first center channel speaker and the second center channel speaker, it becomes possible to localize the sound image of the center channel at the center of the television screen.

Example 2. In FIG. 2, reference numeral (23) denotes a second center channel speaker, which is placed upward on the top plate of the television receiver. The other parts are the same as those in the first embodiment, so their explanation will be omitted.

By arranging the second center channel speaker in this way, the same effects as in the first embodiment can be obtained without changing the appearance of the conventional television receiver.

Example 3. In FIG. 3, (24) is a first delay circuit that time-delays the first center channel audio signal (20). The other parts are the same as those in the second embodiment, so their explanation will be omitted.

By arranging the first delay circuit (24) in this way, the sound reproduced by the first center channel speaker (7) and the sound reproduced by the second center channel speaker (23) reach the listening position. Time differences can be eliminated.

Example 4. In FIG. 4, (25) is a first volume circuit that varies the level of the first center channel audio signal (20), and (26) is a first volume circuit that varies the level of the second center channel audio signal (21). This is the second volume circuit. The other parts are the same as those in the third embodiment, so their explanation will be omitted.

[0024] In this way, the first volume circuit (25)
and a second volume circuit (26) are arranged to change the output sound pressure level of the first center channel speaker (7) and the second center channel speaker (23), making the sound image localization of the center channel clearer. You can.

Example 5. FIG. 5 is a block diagram showing a fifth embodiment of the present invention, and FIG.
is a sectional view of the fifth embodiment, and FIG. 7 is a modified configuration example of the fifth embodiment.

In the figure, (27) is a second delay circuit for time-delaying the second center channel audio signal (21), (28) is a third delay circuit for time-delaying the right channel audio signal (3), (29) is a fourth delay circuit for time-delaying the left channel audio signal (4), and (30) is a fifth delay circuit for time-delaying the rear channel audio signal (5). The other parts are the same as those in Example (3), so the explanation will be omitted.

By arranging the first delay circuit (24) and the second delay circuit (27) in this way, the reproduction sound of the first center channel speaker (7) and the second center channel speaker can be adjusted at the listening position. The reproduced sound in (23) can be made to arrive arbitrarily, and the arrival time difference can be eliminated.

[0028] Also, third, fourth, and fifth delay circuits (28
), (29), and (30), the reproduction sound of the first and second center channel speakers (7) and (23) and the right, left, and rear channel speakers (9), ( It is possible to eliminate the arrival time difference with the reproduced sound in (11) and (13).

Furthermore, as shown in FIG. 7, the same effect can be obtained by using a delay circuit (31) for time-delaying the center channel audio signal (2).

Furthermore, in the first to fifth embodiments described above, the case of a 3-1 system 5-channel stereo for high-definition was explained, but the present invention can also be applied to a Dolby Pro Logic system having a similar channel configuration. , and the same effects as in the above embodiment can be achieved.

Furthermore, although an example has been shown in which one first center channel speaker and one second center channel speaker are arranged, a plurality of speakers may be arranged.

[0032]

[Effects of the Invention] As described above, the present invention has a configuration in which the first center channel speaker is arranged below the screen and the second center channel speaker is arranged above the screen, so that the sound image of the center channel can be improved. It can be localized to the center of the screen, and has the effect of obtaining a natural sound field in which the image and sound image match well.

Further, according to claim 2, since the second center channel speaker is arranged upward,
It is possible to obtain a device that does not change the appearance of conventional devices.

Further, according to claim 3, by time-delaying the first center channel audio signal, the reproduction sound of the first center channel speaker and the reproduction sound of the second center channel speaker at the viewer position are different. It is possible to eliminate the arrival time difference and make the localization of the sound image clearer.

According to claim 4, the reproduction sound pressure level of the first center channel speaker and the second center channel speaker is changed by the first volume circuit and the second volume circuit. The sound image of the center channel can be localized more clearly.

Further, according to claim 5, it is possible to eliminate the arrival time difference between the reproduced sound of the first and second center channel speakers and the reproduced sound of the left, right and rear channel speakers at the viewer position, and to It becomes possible to obtain a natural sound field.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a sectional view showing a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing another configuration example of the fifth embodiment.

FIG. 8 is a block diagram showing the entire audio reproduction section of a conventional audiovisual reproduction device.

FIG. 9 is a sectional view of a conventional audiovisual reproduction device.

FIG. 10 is a front view of a conventional audiovisual reproduction device.

[Explanation of symbols]

(1) Multi-channel audio source (2) Center channel audio signal (6) First center power amplifier (7) First center channel speaker (19) Distributor (20) First center channel audio signal (21
) Second center channel audio signal (22)
Second center power amplifier (23) Second center channel speaker (24) First delay circuit (25) First volume circuit (26) Second volume circuit (27) Second delay circuit (28) Third delay circuit (29) Fourth delay circuit (30) Fifth delay circuit

Claims (5)

[Claims] Claims: 1. A video display means for displaying a video on a screen; a multi-channel audio source for generating multiple channels of audio signals as audio signals; a plurality of speakers configured to output audio signals of the plurality of channels as audio, the plurality of speakers configured to display at least a center channel audio signal among the audio signals of the plurality of channels as a video; a first center channel speaker that outputs as audio from the lower side of the screen of the means; and a second center channel speaker that outputs the center channel audio signal among the plurality of channels of audio signals as audio from the upper side of the screen of the video display means; A video and audio playback device comprising: 2. The audiovisual reproduction device according to claim 1, wherein the second center channel speaker is arranged to output audio upwardly above the screen of the video display means. Device. 3. The audiovisual reproduction device according to claim 1, wherein the center channel audio signal supplied from the multi-channel audio source to the first center channel speaker and/or the second center channel speaker is delayed; 1. A video and audio reproduction device comprising a predetermined number of delay circuits that synchronize arrival times of audio from one center channel speaker and a second center channel speaker to a viewer position. 4. The audiovisual reproduction device according to claim 1, wherein the level of the center channel audio signal supplied from the multichannel audio source to the first center channel speaker and/or the second center channel speaker is adjusted. 1. A video/audio reproducing device characterized by having means. 5. The audiovisual reproduction apparatus according to claim 1, further comprising a predetermined number of delay circuits that delay the audio signals output from the multi-channel audio source and supply the delayed audio signals to the corresponding speakers. A video and audio reproduction device comprising: